Mother Nature or Mint ?

I was rummaging around the other day and came across this large cent. I never really looked at it closely. I tend to think it is laminated on rev, but what is going on with the obv?

 

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Environmental damage is my guess, but I will defer to the experts.

 

So, if this were a detector find, then the copper would bond with other minerals and/or whatnot then oxidize and flake / chip off?

 

Correct

 

Back in the drawer it goes...let the kids find it in twenty years or so...

Thanks for the input @Dougmeister & @paddyman98